N-([1,1'-biphenyl]-4-yl)-N-(4'-(13c-methylspiro[benzo[4,5]pentaleno[1,2,3-kl]acridine-9,9'-xanthene]-5(13cH)-yl)-[1,1'-biphenyl]-4-yl)phenanthren-9-amine

N-([1,1'-biphenyl]-4-yl)-N-(4'-(13c-methylbenzofuro[3',2':4,5]cyclopenta[1,2,3-kl]acridin-5(13cH)-yl)-[1,1'-biphenyl]-4-yl)phenanthren-9-amine

N-([1,1'-biphenyl]-4-yl)-N-(4'-(3-(8-phenyl-8H-fluoreno[4,5-bcd]thiophen-8-yl)-9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-[1,1'-biphenyl]-2-amine

N-([1,1'-biphenyl]-4-yl)-4'-(9-(dibenzo[b,d]thiophen-1-yl)-13c-methyl-9,13c-dihydro-5H-indolo[3',2':4,5]cyclopenta[1,2,3-kl]acridin-5-yl)-N-phenyl-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(9-([1,1'-biphenyl]-4-yl)-13c-methyl-9,13c-dihydro-5H-indolo[3',2':4,5]cyclopenta[1,2,3-kl]acridin-5-yl)-N-phenyl-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(9H-carbazol-9-yl)-N-(3-(8-phenyl-8H-fluoreno[4,5-bcd]furan-8-yl)phenyl)-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(4,4-dimethylfluoreno[4,5-abc]carbazol-8(4H)-yl)-N-phenyl-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(9H-carbazol-9-yl)-N-(4-(7-(naphthalen-1-yl)phenanthren-9-yl)phenyl)-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(13c-methylbenzofuro[3',2':4,5]cyclopenta[1,2,3-kl]acridin-5(13cH)-yl)-N-phenyl-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(1H-azepino[2,3,4,5-def:6,7,1-j'k']dicarbazol-1-yl)-N-phenyl-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-4-yl)-4'-(13c-methyl-9-(triphenylen-2-yl)-9,13c-dihydro-5H-indolo[3',2':4,5]cyclopenta[1,2,3-kl]acridin-5-yl)-N-phenyl-[1,1'-biphenyl]-4-amine

N-([1,1'-biphenyl]-3-yl)-N-(4'-(3,3-dimethyl-14-azafluoreno[3',4',5':3,4,5,6]azuleno[7,8,1-mna]phenanthren-14(3H)-yl)-[1,1'-biphenyl]-4-yl)naphthalen-2-amine

N-(4-butylphenyl)-N-(4'-(7,7-dimethylindeno[1,2-a]carbazol-12(7H)-yl)-[1,1'-biphenyl]-4-yl)-[1,1':3',1''-terphenyl]-5'-amine

N-(4-(benzofuran-2-yl)phenyl)-N-(4-(bicyclo[2.2.1]heptan-2-yl)phenyl)-4'-(3,6-di(benzofuran-2-yl)-9H-carbazol-9-yl)-[1,1'-biphenyl]-4-amine

N-(4'-(9H-dibenzo[b,d]naphtho[2,1-f]azepin-9-yl)-[1,1'-biphenyl]-4-yl)-N-([1,1'-biphenyl]-2-yl)phenanthren-9-amine

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N,2,8-triphenyl-8H-oxazolo[4',5':4,5]benzo[1,2,3-kl]acridin-11-amine

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N-([1,1'-biphenyl]-4-yl)-7,7-dimethyl-7H-benzo[b]fluoreno[3,4-d]thiophen-1-amine

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N-(dibenzo[b,d]furan-1-yl)-9-phenylphenanthro[2,3-d]oxazol-2-amine

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N,8-diphenyl-8H-naphtho[1,2,3-kl]acridin-1-amine

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N-([1,1'-biphenyl]-4-yl)-3-(9,9-dimethyl-9H-fluoren-4-yl)-[1,1'-biphenyl]-4-amine